What type of behavioral adaptation is sleeping? why?

Animals sleep so they can save energy. For example, Bears will hibernate in the winter because it is harder to find food. So they will sleep in order to save their energy.

Hope i'm not to late :)

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]